Alkaline, Pnictogen, Ternary, Energy gap for direct transition

• Bi-Ca-O
• Mg-P-Si
• Bi-Ca-Mg
• As-Ca-Cd
• Ba-P-Sn
• ternary
• alkaline
• pnictogen
• non-disordered
• trigonal
• hexagonal
• tetragonal
• cubic
• monoclinic